Delete nack_enabled flag in encoder configuration.

This is a followup to cl https://webrtc-review.googlesource.com/71380,
which reworked the way encoder resilience is done, and made the
nack_enabled flag unused.

Bug: webrtc:8830
Change-Id: I3de2508c97bc71e01c8f2232d16cd1f33e57fe4a
Reviewed-on: https://webrtc-review.googlesource.com/69986
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23080}
diff --git a/modules/video_coding/include/video_codec_initializer.h b/modules/video_coding/include/video_codec_initializer.h
index 0748db0..fa2582f 100644
--- a/modules/video_coding/include/video_codec_initializer.h
+++ b/modules/video_coding/include/video_codec_initializer.h
@@ -34,10 +34,20 @@
   static bool SetupCodec(
       const VideoEncoderConfig& config,
       const std::vector<VideoStream>& streams,
-      bool nack_enabled,
       VideoCodec* codec,
       std::unique_ptr<VideoBitrateAllocator>* bitrate_allocator);
 
+  // TODO(nisse): Deprecated, delete as soon as downstream projects are
+  // updated.
+  static bool SetupCodec(
+      const VideoEncoderConfig& config,
+      const std::vector<VideoStream>& streams,
+      bool /* nack_enabled */,
+      VideoCodec* codec,
+      std::unique_ptr<VideoBitrateAllocator>* bitrate_allocator) {
+    return SetupCodec(config, streams, codec, bitrate_allocator);
+  }
+
   // Create a bitrate allocator for the specified codec.
   static std::unique_ptr<VideoBitrateAllocator> CreateBitrateAllocator(
       const VideoCodec& codec);
@@ -45,8 +55,7 @@
  private:
   static VideoCodec VideoEncoderConfigToVideoCodec(
       const VideoEncoderConfig& config,
-      const std::vector<VideoStream>& streams,
-      bool nack_enabled);
+      const std::vector<VideoStream>& streams);
 };
 
 }  // namespace webrtc